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UNITED STATES ATENT OFFICE.

THEODOR A. TERTELING, OF KANSAS CITY, KANSAS, ASSIGNOR TO HIMSELE, BERNARD H. TERTELING, AND ROBERT L. MCALPINE, OE SAME PLACE.

FURNACE.

SPECIFICATION forming part of Letters Patent No. 419,380, dated January 14, 1890.

Application filed April 23, 1889. Serial No. 308,286. (No model).

To all whom, it may concern/.-

Be it known that I, THnoDoR A. TERTEIF ING, of Kansas Oity, in the county of Vyan- (lotte and State of Kansas, have invented a new and Im provedFurnace, of which the following is a full, clear, and exact description.

The invention is an improvement in the class of steam-boiler furnaces in which the bridge-,wall is built close up to the boiler and provided with openings that communicate with both the tire-box proper and the ash-pit, (or space below the grate,) so that unconsu med carbon and gases escaping from the fire-box are mingled with air drawn from the ash-pit, thus forming a new combustible compound which ignites and becomes consumed, thereby effecting an economy in fuel.

The improvement consists in the combination and arrangement of parts, as herein described and claimed.

Reference is to be had to the accompanying drawings, forming a part of this speciiication, in which similar letters of reference indicate corresponding parts in both figures.

Figure l is a sectional side elevation of the improvement, and Fig. 2 is a transverse section of the same on the line x 00 of Fig. l.

In the walls of the furnace A is supported, in the usual manner, the boiler B, of any approved construction. In the frontend of the furnace A is formed the hre-box O, in which are held the grate-bars D, discharging into the ash-pit E, formed below the said gratebars. The fire-box O and the ash-pit E are provided with the usual doors F and G, respectively. The bridge-wall H forms a back for the fire-box O and the ash-pit E, and extends close up to and around the boiler B until it meets the side walls of the furnace. In the bridge-Wall H are arranged a number of upwardly-slanting and longitudinally-extending openings I, which connect the rearv of the furnace with the tire-box O and the ash-pit E. The inner ends of the grate-bars The unconsumed carbon and gases arising 5o from the burning fuel on the grate-bars D in the fire-box C pass into the tops of the openings I, and are there mixed with air from the ash-pit E, passing into the lower parts of the said openings I, the point where they begin to intermingle being at the rear end of the grate, so that there is no appreciable loss of heat, and the most perfect combustion is secured. The mixture of air and gases thus formed in the openings I is combustible, and 6o bustion is obtained and the capacity of the 7o boiler is greatly enlarged.

It is to be understood that the part of the bridge-wall H above the openings I in the fire-box C deflects the smoke and gases arising from the fuel, so that the smoke and gases pass into the openings I. As the latter slant upward, the burning gases can escape freely after being ignited by the burning fuel on the grate-bars.

Having thus fully described my invent-ion', 8o

I claim as new and desire to secure by Letters Patent- As the improvement hereinbefore described, the combination, with the boiler and grate, of

Vthe bridge-wall having openings slanting upward, andtheir inner ends extending both above and below the grate, as shown and described, so that the heated unconsumed carbon and gases from the fire-box and air from the ash-pit mingle freely at the point where 9o the rear end of the grate terminates, as specified.

THEODOR A. TERTELING.

Vitn esses:

JOHN B. APPEL, R. L. MCALPINE.

At the rear end of the furo5 

